In our previous study we found a lower proportion of T lymphocytes (CD4+ and CD8+ subsets), B lymphocytes, eosinophils and basophils in COVID-19 with interstitial lesions on chest X-ray than in healthy controls but we did not observe the differences in absolute number of analyzed leukocytes subpopulations between patients with and without lung lesions on chest X-ray [17]. The gene discussed is CD4; the disease is COVID-19.